Before you make your purchase, be sure to audition the McIntosh 6900 or 6500 integrated amps. I found them to be superb performers with the b&w 805 speakers. The build quality, and features, and resale value are also excellent.
Many Mac dealers will let you try one out in your home with your speakers. (absolutely a must)
By the way I had the musical fidelity A300 with the 805's. A very nice piece, and good sound. The Mac gave me better sound and better bass out of the 805's.
Hope this helps,
Bennett